linux-kernel - Re: 6.10/regression/bisected - after f1d97e769152 I spotted increased execution time of the kswapd0 process and symptoms as if there is not enough memory

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Message-Id: <93b5fac5-6315-4f2e-a2df-37ef4bf56f9e@app.fastmail.com>
Date: Tue, 02 Jul 2024 15:46:30 -0400
From: "Chris Murphy" <lists@...orremedies.com>
To: "Filipe Manana" <fdmanana@...nel.org>,
 Михаил Гаврилов <mikhail.v.gavrilov@...il.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>,
 "Linux regressions mailing list" <regressions@...ts.linux.dev>,
 "Btrfs BTRFS" <linux-btrfs@...r.kernel.org>,
 "David Sterba" <dsterba@...e.com>, "Josef Bacik" <josef@...icpanda.com>
Subject: Re: 6.10/regression/bisected - after f1d97e769152 I spotted increased
 execution time of the kswapd0 process and symptoms as if there is not enough
 memory

On Tue, Jul 2, 2024, at 1:22 PM, Filipe Manana wrote:
> On Tue, Jul 2, 2024 at 3:13 PM Mikhail Gavrilov
> <mikhail.v.gavrilov@...il.com> wrote:

>> Unfortunately, the patch didn't improve anything.
>> kswapd0 still consumes 100% CPU under load.
>> And my system continues to freeze.
>
> Ok, the concerning part is the freezing and high cpu usage.

We're seeing this in Fedora Rawhide, which is always using the most recent mainline kernel. 

User first reported June 25 they were experiencing much longer backup times, normal is ~5 minutes, they're taking 1+ hours now, with frequent freezes of the DE, notices kswapd using 100% CPU and then other processes also start hanging with 100% CPU. Resolution is a power cycle and reverting to 6.9 series.

The workload is described as "restic via ssh to a repo on a backup server".

I can try to get more info to narrow down the last known good and first known bad kernels if that's useful.

-- 
Chris Murphy